DREAMWEB: Also filter out invalid characters in getNextWord()

Thanks again to eriktorbjorn for spotting this. This one should be the
last place where we should filter out invalid characters

engines/dreamweb/print.cpp

@@ -49,7 +49,9 @@ uint8 DreamWebEngine::getNextWord(const GraphicsFile &charSet, const uint8 *stri
 			return 0;
 		}
 		firstChar = modifyChar(firstChar);
-		if (firstChar != 255) {
+		// WORKAROUND: Also filter out invalid characters here (refer to the
+		// workaround in printChar() below for more info).
+		if (firstChar >= 32 && firstChar != 255) {
 			uint8 secondChar = *string;
 			uint8 width = charSet._frames[firstChar - 32 + _charShift].width;
 			width = kernChars(firstChar, secondChar, width);